# a=8
# a+=2
# print(a)
# a -= 2
# print(a)
# a *= 2
# print(a)
# a /= 2
# print(a)
#
# a = 2
# b = 11
# print(a == b)
# print(a != b)
# print(a > b)
# print(a < b)
# print(a >= b)
# print(a <= b)
# print(True and False)
# print(True and True)
# print(True or False)
# print(not False)
# stat="hallo"
# print("h" in str1)
# print("a" in str1)
# print("c" not in str1)
# print("o" not in str1)
# score=eval(input("请输入成绩分数:"))
# if score<60:
#     print("成绩不及格")
# if 60<=score<80:
#     print("成绩一般")
# if 80<score<=90:
#     print("成绩良好")
# if 90<score<=100:
#     print("成绩优秀")
# score=eval(input("请输入成绩分数:"))
# if 60<=score:
#     print("成绩已及格")
#     if 90<score<=100:
#         print("成绩优秀")

